Saturn.
It has a mean density of 0.687 g/cm3 which is less than water.
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Saturn would be the planet that would float in water due to its low density. Saturn is made mostly of hydrogen and helium, which are gases that are less dense than water. If you could find a big enough bathtub, Saturn would float!
It is impossible to really find out because we cannot measure the mass and volume of a planet, but the most possible is gas planets because gas should not be too dense.
Saturn, because it has an extremely low density, can "float on water if you can find a pool big enough". ~Ripley's Believe it or Not 2010 Special Edition.
Saturn is the planet known for its system of rings. It is the only planet in our solar system that would float in a large enough tub of water because it is less dense than water.
The planet Saturn could theoretically float on giant planet like Jupiter because Saturn has a lower density than Jupiter due to its composition being mostly gas and liquid. This would mean that Saturn would have the ability to "float" in the atmosphere of Jupiter, similar to how a boat floats on water.
Yes, you would float more easily in water on a planet with weaker gravity because the reduced gravitational force would make you less dense relative to the water, allowing you to float more effortlessly.
No, Saturn is not the only planet that would float on water. Saturn has a low density, causing it to float in water, but other gas giants like Jupiter and Uranus also have low enough densities that they would float in water as well.
No you would sink fasters as water molecules would be farther apart.